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FILE - In this Sept. 16, 2008 file photo, then-Democratic vice presidential candidate Sen. Joe Biden, D-Del. mingles with passengers aboard the Amtrak Acela train from Washington to Wilmington, Del. Warning to Amtrak from Mitt Romney and Republicans: You're on your own. The platform Republicans adopted at their convention includes a call for full privatization and an end to subsidies for the nation's passenger rail operator, which gobbled up almost $1.5 billion in federal funds last year. (AP Photo/Gerald Herbert, File)
/ AP